Test #10: Auxiliary Fan/Relay Expansion - Whirlpool WED99HEDW0 Technical Education

DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.

TEST #10: Auxiliary Fan/Relay Expansion

This test is performed when the auxiliary fan is not spinning.
NOTE: To test the Auxiliary Fan, plug in dryer or reconnect
power. Press power, select Timed Dry, High Temp, and press
Start. Fan should start running.
The following items are part of this system:
Part of Moisture System
Harness/connection
Auxiliary Fan
Machine control electronics
1. Unplug dryer or disconnect power.
2. Remove the fan grill on back panel to access auxiliary fan.
Verify the grill and fan blades are free from obstructions
and can spin.
3. Remove top panel to access machine electronics.
4. Visually check that the J2 connector is inserted all the way
into the Relay Expansion board. Refer to Figure 1
J3 - To Cycle Control Unit
Figure 1 - Relay Expansion Board
For Service Technician Use Only
Electric Dryer
ü
ü
ü
J1 - AC In
= pin 1
J2 - To Auxiliary Fan
¾ If visual check passes, go to step 4.
¾ If connector is not inserted properly, reconnect J2 and
retest.
5. Remove connector J2 from the Relay Expansion board.
With an ohmmeter, measure the resistance across pins 1
and 3.
6. Resistance should be approximately 130 Ω ±10% .
¾ If the reading is infinite (open), go to step 7.
¾ If the reading is correct, go to step 11.
7. Remove the rear panel to access auxiliary fan.
8. Visually check that the in-line fan connector (yellow wires)
is securely connected (see Figure 2).
Check In-line
Fan Connector
Figure 2 - Auxiliary Fan
¾ If visual check passes, go to step 9.
¾ If connections are loose, reconnect the in-line fan
connector and retest.
9. With an ohmmeter, check harness for continuity between
the fan and Relay Expansion board.
¾ If there is continuity, go to step 10.
¾ If there is no continuity, repair or replace the upper
dryer harness and retest.
10. With an ohmmeter, measure the resistance across the
two fan connector terminals. Resistance should be
approximately 130 Ω ±10% .
¾ If the reading is infinite (open), replace the auxiliary fan
and retest.
¾ If the reading is correct, go to step 11.
11. With voltmeter set to AC, connect black probe to Relay
Expansion board J1-2 (N) and red probe to J1-1 (L1). (See
Figure 1.) Plug in dryer or reconnect power.
¾ If 120VAC is present, unplug dryer or disconnect power
and go to step 12.
¾ If 120VAC is not present, unplug dryer or disconnect
power and perform TEST #2: Supply Connections, page 6-6.
12. With voltmeter set to AC, connect black probe to Relay
Expansion board J2-1 and red probe to J2-3. (See Figure
1.) Plug in dryer or reconnect power.
¾ If 120VAC is present, go to step 13.
¾ If 120VAC is not present, unplug dryer or disconnect
power and replace the Relay Expansion board.
13. If the preceding steps did not correct the auxiliary fan
problems, replace the CCU.
¾ Unplug washer or disconnect power.
¾ Replace the CCU.
¾ Reassemble all parts and panels.
¾ Retest auxiliary fan operation.
HybridCare™ Dryer with Heat Pump Technology
TESTING
Aux. Fan
Screws
6-21
n